There is a steady check in an old civilisation upon the fertility of the abler classes: the improvident and unambitious are those who chiefly keep up the breed. So the race gradually deteriorates, becoming in each successive generation less fit for a high civilisation.

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Quote text and notes from Wikiquote: Francis Galton (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.